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Old 12-27-2017, 01:47 PM
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Adam Adam is offline
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Join Date: Oct 2005
Location: Phoenix, AZ
Posts: 2,344
1965 RCA 19" b/w KCS149 with remote

This TV is finally, finally working. I had to move my operation onto the kitchen table to get away from the cold in the garage.

The problem with the picture overloading was twofold. The wire that connects the boost voltage to the 1st anode of the CRT had come loose. The picture was going totally black when it was receiving any signal at all. But even after I fixed that, I still had the problem that depending on where I put the fine tuning I either had a snowy picture or overloaded picture, and the AGC control was completely ineffective even though the AGC circuit seemed to be operating ok. I had checked every component in the AGC circuit over and over again, tried substituting several 6AK8s in, and even checked with the scope to see what those horizontal pulses going into the plate of the ACG tube looked like. And none of that did any good. It turned out to be the resistor circled in the schematic. I would up changing the two next to it too (which were up by about 20% in value), but that one 68K was way up over 400K.

The picture of the set working was taken with no antenna attached and transmitting from down in the opposite side of the basement. I'll talk about the remote stuff in the next post...
Attached Images
File Type: jpg 65rca1.jpg (27.6 KB, 38 views)
File Type: jpg 65rca2.jpg (56.1 KB, 27 views)
File Type: jpg 65rca3.jpg (57.9 KB, 42 views)
File Type: jpg 65rca4.jpg (29.5 KB, 50 views)
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Last edited by Adam; 12-27-2017 at 04:28 PM.
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